Wed, 27 Jan 2016 from Federico Bruni:
> Actually, the source code is available here:
>
http://git.savannah.gnu.org/cgit/lilypond.git/tree/Documentation/ly-examples
Thanks for the link!
An upper-level directory was removed in 2009:
http://git.savannah.gnu.org/cgit/lilypond.git/commit/?id=11a53dff1e2552e5b9b3ea5629a86f19086098fc
The directory is named "input/mutopia"...
meanwhile, I can't find "Petite Ouverture à danser" by Erik Satie at
http://www.mutopiaproject.org (probably removed from mutopia site due
to the lack of sources?).